JP3886416B2 - Method for producing elastic wheel - Google Patents

Method for producing elastic wheel Download PDF

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Publication number
JP3886416B2
JP3886416B2 JP2002164088A JP2002164088A JP3886416B2 JP 3886416 B2 JP3886416 B2 JP 3886416B2 JP 2002164088 A JP2002164088 A JP 2002164088A JP 2002164088 A JP2002164088 A JP 2002164088A JP 3886416 B2 JP3886416 B2 JP 3886416B2
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Japan
Prior art keywords
annular
mold
rubber
wheel
rim
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JP2002164088A
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Japanese (ja)
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JP2004009820A (en
Inventor
秀史 柳
勝巳 田代
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Bridgestone Corp
Topy Industries Ltd
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Bridgestone Corp
Topy Industries Ltd
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Description

【0001】
【発明の属する技術分野】
本発明は、車両の車輪に用いられる弾性ホイールの製造方法に関し、詳しくは、乗り心地性能、防振性能および防音性能に優れた弾性ホイールを長期使用時の耐久性および安全性を損なうことなく高い生産性にて製造する方法に関する。
【0002】
【従来の技術】
弾性ホイールは、一般に車軸ハブに固着されるディスクとタイヤを支承するリムとを備えており、かかるディスクとリムとの間に防振体を設け、防振性能や乗り心地性能を高めた弾性ホイールはこれまで種々提案されている。例えば、実開昭59−188701号公報には、防振体としてバネを用いて乗り心地の向上を図ったタイヤ用ホイールが提案されている。
【0003】
また、防振体としてゴムを使用し、これをリムとディスクとの間に配置したものも知られており、例えば、実開昭57−73203号公報に、リムがゴム様弾性体を介してディスクに連結される構成の弾性ホイールが提案されている。さらに、特開平5−338401号公報には、リムと弾性ホイールとの間に隙間を形成し、そこに防振ゴムを介装させた弾性ホイールが開示されている。さらにまた、WO98/33666号公報には、リムと同一プロファイルを有する内側リムとリムとの間にゴムの環状ストリップを配置したホイール・バリア組立体が開示されている。
【0004】
【発明が解決しようとする課題】
しかしながら、防振体としてゴムを使用し、これをリムとディスクとの間に一様に配置した従来の弾性ホイールにおいては、リムの内周面とディスクの外周面との間に夫々に加硫接着されたゴム弾性体が配設されているため、このゴム弾性体によりリムからディスクに伝わる軸方向、径方向および回転方向の各振動を的確に抑制することができるものの、大荷重時のゴム弾性体の変位を抑制することはできないという問題があった。すなわち、ゴムの断面が一様であり、小入力時から大入力時までのそれぞれにおいて適切な振動防止特性を得ることが困難であった。この点について、防振体としてばねを用いても同様の問題があった。
【0005】
また、リムとディスクとの間にゴム弾性体を配置して防振効果を得る弾性ホイールの場合には、実車に装着して走行した際の長期使用時におけるゴム弾性体の疲労破壊が問題となる。従って、単に防振性能等を高めることのみならず、実使用時におけるゴム弾性体の耐久性を向上して、十分な実用性を備えた弾性ホイールを実現することのできる製造技術が望まれていた。
【0006】
そこで本発明の目的は、小入力時から大入力時に至るまでの乗り心地性能、防振性能および防音性能に優れた弾性ホイールを耐久性および安全性を損なうことなく高い生産性にて製造する方法を提供することにある。
【0007】
【課題を解決するための手段】
本発明者らは、上記課題を解決すべく鋭意検討した結果、所定の構成にてリムとディスクとの間にゴム弾性体を配した弾性ホイールにおいて、乗り心地性能、防振性能および防音性能の向上を図ることができることを見出し、さらに鋭意検討した結果、かかる弾性ホイールを耐久性および安全性を損なうことなく高い生産性にて製造することができることを見出し、本発明を完成するに至った。即ち、上記課題を解決するために、本発明の弾性ホイールは下記に示す通りである。
【0008】
〈1〉車軸ハブに固着されるディスクと、タイヤを支承するリムとを備え、前記リムの内周面に環状に固設された一対のガイドと、前記ディスクの外周面にホイール半径方向外方に環状に突出する突出部とを有し、該突出部に、前記リムの内周面との間に間隙をもって、前記一対のガイド間のホイール軸方向の全幅にわたって一体的に、ゴム弾性体が環状に固着され、かつ、軸方向両側に延在する該ゴム弾性体の両端部が夫々前記一対のガイドの、ホイール軸方向に対向する両側面に固着された弾性ホイールの製造方法において、
(ア)下型に、一方の前記ガイドを形成するガイド用環状部材を型入れする工程と、
(イ)前記ガイド用環状部材が型入れされた下型に、ディスク本体を、該ガイド用環状部材のゴム弾性部材固着面と該ディスク本体の突出部側面との間に適宜間隙を設けて同軸状に型入れする工程と、
(ウ)環状中型を前記ディスク本体の突出部の外周面外側に、該外周面と適宜間隙を設けて同軸状に配置し、該環状中型に、他方の前記ガイドを形成するガイド用環状部材を、そのゴム弾性部材固着面と前記ディスク本体の突出部側面との間に適宜間隙を設けて同軸状に型入れする工程と、
(エ)前記ゴム弾性体形成用の未加硫ゴム注入孔を1個所以上有する上型を前記環状中型上に同軸状に載置する工程と、
(オ)前記未加硫ゴム注入孔から未加硫ゴムを注入した後、加熱して該未加硫ゴムを加硫し前記ゴム弾性体を形成する工程と、
(カ)加硫後に型から取り出されたディスク本体に前記ゴム弾性体を介して固着されたガイド用環状部材にリムを装着する工程と、
を含むことを特徴とする弾性ホイールの製造方法。
【0009】
〈2〉前記〈1〉の弾性ホイールにおいて、前記環状中型をホイール半径方向に2〜4分割とし、注入された未加硫ゴムを分割部から逃がす弾性ホイールである。
【0010】
〈3〉前記〈1〉または〈2〉の弾性ホイールにおいて、前記未加硫ゴム注入孔が、前記上型に等間隔で4〜8個同軸状の円周上に穿設されている弾性ホイールである。
【0011】
前記〈1〉〜〈3〉の発明は、以下の作用効果を奏する。
前記〈1〉の発明により製造された弾性ホイールは、リムとディスクとの間に介装されたゴム弾性体の剪断変形で振動を吸収し、特に小入力に対して乗り心地性能、防振性能および防音性能の向上を図ることができるとともに、ディスク外周面上のホイール半径方向外方に設置されたゴム弾性体がストッパの役割を果たし、大入力に対する大変形をも効果的に抑制することができる。また、防音性能については、100Hz以上の高周波領域の防音に極めて効果的である。さらに、本発明の製造方法においては、ガイド間に配置されディスクの突出部に固着される所定形状のゴム弾性体を均一かつ迅速に加硫接着により設置することができ、耐久性および安全性を損なうことなく高い生産性を有する。
【0012】
また、前記〈2〉の発明により、注入された未加硫ゴムを分割部から逃がすことで、該未加硫ゴムを型内の弾性ゴム形成領域に完全にかつ均一に充填することができる。
【0013】
さらに、前記〈3〉の発明により、設置される弾性ゴムの真円性を損なうことなく、該未加硫ゴムを型内の弾性ゴム形成領域に迅速かつ均一に充填することができる。
【0014】
【発明の実施の形態】
以下、本発明の実施の形態について説明する。
図1に、本発明の方法により製造される弾性ホイールを示す。図1に示す弾性ホイールは、車軸ハブ(図示せず)に固着されるディスク1と、タイヤを支承するリム2とを備えており、リム2の内周面とディスク1の外周面との間にゴム弾性体としてのゴム弾性体3が剪断変形可能に介装されている。
【0015】
即ち、この弾性ホイールにおいては、ディスク1の外周面に、ホイール半径方向外方に環状に突出する突出部4が一体的に形成されており、この突出部4に、ホイール軸方向両側に延在するゴム弾性体3が、リム2の内周面との間に適宜間隙をもって加硫接着により環状に固着されている。
【0016】
一方、リム2の内周面には一対のガイド5a、5bが環状に固設されており、上記ゴム弾性体3の軸方向両端部がこの一対のガイド5a、5bの、ホイール軸方向に対向する両側面に夫々加硫接着により固着されている。これにより、ゴム弾性体3を介してリム2とディスク1とが連結され、ゴム弾性体3は剪断変形可能となる。
【0017】
ゴム弾性体3は、少なくともホイール軸方向両側に延在すれば、その剪断歪みにより弾性ホイールとしての防振機能を発揮し得るが、本発明において製造する弾性ホイールは、大入力時の大変形の防止効果をも得るために、図示するように、ゴム弾性体3をリム2の内周面とディスク1の突出部4との間にも介在させてある。即ち、ゴム弾性体3を、一対のガイド5a、5b間のホイール軸方向の全幅にわたって一体的に介装させてある。これにより、ゴム弾性体3の剪断変形によって小入力時の小変形の抑制、防止効果が得られることに加え、ゴム弾性体3の突出部4のホイール半径方向外方面に連続的に存在する部分に、大入力時において突出部4とリム2の内周面との衝突を回避するためのストッパとしての機能を持たせることができる。
【0018】
上述した本発明に係る弾性ホイールの製造においては、ゴム弾性体3の形成法がその性能上重要になってくる。即ち、弾性ホイールの耐久性および安全性を損なわないようにする上で、ゴム弾性体3を均一にかつ良好な加硫接着にて固着させることが重要となってくる。このために本発明では、図2に示すような下型20、環状中型30、上型40の3種類の型を用意する。これら型を用いて、ゴム弾性体が加硫接着されるディスク本体と、2個のガイド用環状部材との間にゴム弾性体を加硫接着する。
【0019】
用意するディスク本体11は、ディスク本体11の外周面にホイール半径方向外方に環状に突出する突出部14を有するものであれば特にそのタイプは制限されるものではなく、スポークやメッシュ等の支持体と組合わせたスポークホイールやメッシュホイール等であってもよい。また、ディスクの材質は、ゴム弾性体が加硫接着し得るスチール、アルミニウム、マグネシウム、チタン、合成樹脂等、いずれの材質でもよいが、軽量化に主眼を置くときはアルミニウム、チタンまたは合成樹脂が好ましい。2個のガイド用環状部材15a,15bも、ディスク本体と同様の材質とすることができる。
【0020】
また、ガイド用環状部材15a,15bはリムの内周面に容易に取付けできるようにフランジ16a,16bを設けておくことが好ましい。
【0021】
本発明の製造工程においては、図3に示すように、先ず、工程(ア)として、下型20に、一方のガイドを形成するガイド用環状部材15bを型入れし、次いで、工程(イ)として、このガイド用環状部材15bが載置された下型20に、ディスク本体11を、ガイド用環状部材15bのゴム弾性部材固着面とディスク本体11の突出部14の側面との間に適宜間隙を設けて同軸状に型入れする。
【0022】
次に、図4に示すように、先ず、工程(ウ)として、環状中型30をディスク本体11の突出部14の外周面外側に、この外周面と適宜間隙を設けて同軸状に配置する。なお、環状中型30の内径は、ディスク本体11の突出部14の外径よりも大きく設定してある。次いで、この環状中型30に、他方のガイドを形成するガイド用環状部材15aを、そのゴム弾性部材固着面とディスク本体11の突出部14の側面との間に適宜間隙を設けて同軸状に型入れする。環状中型30はホイール半径方向に2〜4分割とすることができ、好ましくは、図2に示すように、ホイール半径方向に2分割とし、注入された未加硫ゴムを分割部31から逃がすようにすることが好ましい。
【0023】
次に、図5に示すように、工程(エ)として、ゴム弾性体形成用の未加硫ゴム注入孔41を1個所以上有する上型40を環状中型30上に載置する。未加硫ゴム注入孔41は、多く設ければそれだけ早く注入することができるが、注入孔41が多すぎるとゴム弾性体の真円性に問題が生ずるため、上型40に等間隔で4〜8個の注入孔41が同軸状の円周上に穿設されていることが好ましい。
【0024】
上型40を載置した後、工程(オ)として、未加硫ゴム注入孔41から未加硫ゴムを注入する。未加硫ゴムの注入に際して、未加硫ゴム注入孔41が2個所の場合、図6の(A)に模式的に示すように、分割上型の分割面31に対して垂直方向から未加硫ゴムを注入することにより未加硫ゴムを型内に均一に注入することができる。また、未加硫ゴム注入孔41が4個所の場合は(B)に示すように、6個所の場合は(C)に示すように、さらに8個所の場合は(D)に示すように、上型40に等間隔で穿設することが好ましい。未加硫ゴムの注入が終了した後、型を加熱し、未加硫ゴムを加硫してゴム弾性体を形成する。かかる加硫条件は特に制限されるべきものではなく、通常の加硫条件に従えばよい。
【0025】
本発明において使用し得る未加硫ゴムは、防振ゴムとして既知のものを用いることができ、天然ゴムや合成ゴム、例えば、ブタジエンゴム、スチレンブタジエン共重合体ゴム、ブチルゴム等のジエン系ゴムや、エチレンプロピレンジエン三元共重合体(EPDM)などのゴムに適宜配合剤、例えば、硫黄、加硫促進剤、老化防止剤、カーボンブラック等を適宜配合することにより調製することができる。加硫後のゴム弾性体のJIS−A硬度(Hd)は、振動吸収特性と耐久性の観点から、好ましくは30〜80°であり、弾性率は1×103〜1×105N/cm2である。
【0026】
上述のように、ゴム弾性体が形成されたディスク本体11を型から取り出し、然る後、工程(カ)として、ディスク本体11に加硫ゴムを介して固着されたガイド用環状部材15a,15bにリムを装着する。
【0027】
リムへの装着は、ガイド用環状部材15a,15bのフランジ16a,16bを介して、溶接や接着剤やビスによるネジ止め等の通常の接合手段により行うことができる。尚、リム自体の構造については特に制限されず、例えば、リム組を容易にするために、図示するように、ドロップ部を設けておいてもよい。
【0028】
【発明の効果】
以上説明してきたように、本発明によれば、小入力時から大入力時に至るまでの乗り心地性能、防振性能および防音性能に優れた弾性ホイールを耐久性および安全性を損なうことなく高い生産性にて製造することができる。
【図面の簡単な説明】
【図1】本発明に係る弾性ホイールの回転軸に沿った拡大部分断面図である。
【図2】本発明に使用する下型、中型、上型を示す斜視図である。
【図3】本発明工程(ア)および(イ)を示す説明図である。
【図4】本発明工程(ウ)を示す説明図である。
【図5】本発明工程(エ)を示す説明図である。
【図6】未加硫ゴムの注入方向を示す説明図である。
【符号の説明】
1 ディスク
2 リム
3 ゴム弾性体
4,14 突出部
5a,5b ガイド
11 ディスク本体
15a,15b ガイド用環状部材
16a,16b フランジ
20 下型
30 環状中型
31 分割部
40 上型
41 注入孔
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing an elastic wheel used for a vehicle wheel, and more specifically, an elastic wheel excellent in riding comfort performance, vibration proof performance, and soundproof performance is high without impairing durability and safety during long-term use. The present invention relates to a method of manufacturing with productivity.
[0002]
[Prior art]
An elastic wheel generally includes a disk that is fixed to an axle hub and a rim that supports a tire. An elastic wheel is provided with a vibration isolator between the disk and the rim to improve vibration proof performance and riding comfort. Various proposals have been made so far. For example, Japanese Utility Model Publication No. 59-188701 proposes a tire wheel that uses a spring as a vibration isolator to improve riding comfort.
[0003]
Further, it is also known that rubber is used as a vibration isolator and this is disposed between a rim and a disk. For example, in Japanese Utility Model Publication No. 57-73203, a rim is interposed via a rubber-like elastic body. An elastic wheel configured to be coupled to a disk has been proposed. Furthermore, Japanese Patent Laid-Open No. 5-338401 discloses an elastic wheel in which a gap is formed between a rim and an elastic wheel, and an anti-vibration rubber is interposed there. Furthermore, WO 98/33666 discloses a wheel barrier assembly in which an annular strip of rubber is disposed between an rim and an inner rim having the same profile as the rim.
[0004]
[Problems to be solved by the invention]
However, in a conventional elastic wheel that uses rubber as a vibration isolator and is uniformly disposed between the rim and the disk, vulcanization is performed between the inner peripheral surface of the rim and the outer peripheral surface of the disk. Since a bonded rubber elastic body is provided, the rubber elastic body can accurately suppress vibrations in the axial direction, radial direction and rotational direction transmitted from the rim to the disk. There was a problem that the displacement of the elastic body could not be suppressed. That is, the rubber has a uniform cross section, and it has been difficult to obtain an appropriate vibration preventing characteristic from the time of small input to the time of large input. About this point, even if it used the spring as a vibration isolator, there existed the same problem.
[0005]
In addition, in the case of an elastic wheel in which a rubber elastic body is disposed between the rim and the disk to obtain an anti-vibration effect, fatigue failure of the rubber elastic body during long-term use while running on an actual vehicle is a problem. Become. Therefore, there is a demand for a manufacturing technique that can not only simply improve the vibration-proof performance but also improve the durability of the rubber elastic body during actual use and realize an elastic wheel with sufficient practicality. It was.
[0006]
Accordingly, an object of the present invention is a method of manufacturing an elastic wheel excellent in ride comfort performance, vibration proof performance and sound proof performance from a small input to a large input with high productivity without impairing durability and safety. Is to provide.
[0007]
[Means for Solving the Problems]
As a result of intensive studies to solve the above-mentioned problems, the present inventors have found that an elastic wheel in which a rubber elastic body is disposed between a rim and a disk with a predetermined configuration has a ride comfort performance, a vibration proof performance, and a sound proof performance. As a result of finding that improvement can be achieved and further intensive studies, it was found that such an elastic wheel can be manufactured with high productivity without impairing durability and safety, and the present invention has been completed. That is, in order to solve the above problems, the elastic wheel of the present invention is as follows.
[0008]
<1> A pair of guides provided with a disk fixed to the axle hub and a rim for supporting a tire, and annularly fixed to the inner peripheral surface of the rim; A rubber elastic body integrally formed over the entire width in the wheel axial direction between the pair of guides, with a gap between the protrusion and the inner peripheral surface of the rim. In the method of manufacturing an elastic wheel, which is fixed in an annular shape, and both ends of the rubber elastic body extending on both sides in the axial direction are fixed to both side surfaces of the pair of guides opposed to each other in the wheel axial direction.
(A) placing a guide annular member forming one of the guides in the lower mold;
(A) A disc body is coaxially disposed in a lower mold in which the annular guide member is placed, with an appropriate gap provided between a rubber elastic member fixing surface of the annular guide member and a side surface of the protruding portion of the disc body. The process of mold-molding,
(C) An annular intermediate mold is arranged outside the outer peripheral surface of the projecting portion of the disk main body and coaxially with the outer peripheral surface, and an annular guide member for forming the other guide is formed on the annular intermediate mold. , A step of providing a suitable gap between the rubber elastic member fixing surface and the side surface of the projecting portion of the disk body, and mold the same coaxially;
(D) a step of coaxially placing an upper mold having one or more unvulcanized rubber injection holes for forming the rubber elastic body on the annular middle mold;
(E) injecting unvulcanized rubber from the unvulcanized rubber injection hole and then heating to vulcanize the unvulcanized rubber to form the rubber elastic body;
(F) a step of attaching a rim to the annular guide member fixed to the disc main body taken out of the mold after vulcanization via the rubber elastic body;
The manufacturing method of the elastic wheel characterized by including.
[0009]
<2> The elastic wheel according to <1>, wherein the annular middle mold is divided into 2 to 4 parts in a wheel radial direction, and the injected unvulcanized rubber is released from the divided part.
[0010]
<3> The elastic wheel according to the item <1> or <2>, wherein the unvulcanized rubber injection holes are formed on the upper die at an equal interval on a coaxial circumference. It is.
[0011]
The inventions <1> to <3> have the following effects.
The elastic wheel manufactured in accordance with the invention <1> absorbs vibrations due to the shear deformation of a rubber elastic body interposed between the rim and the disk, and is particularly comfortable to ride and vibration-proof for small inputs. In addition to improving the soundproofing performance, the rubber elastic body installed on the outer periphery of the disk in the radial direction of the wheel serves as a stopper, effectively suppressing large deformation against large inputs. it can. The soundproofing performance is extremely effective for soundproofing in a high frequency region of 100 Hz or higher. Furthermore, in the manufacturing method of the present invention, a rubber elastic body having a predetermined shape, which is disposed between the guides and is fixed to the protruding portion of the disk, can be installed uniformly and quickly by vulcanization adhesion, and durability and safety can be improved. High productivity without loss.
[0012]
Further, according to the invention <2>, the injected unvulcanized rubber is allowed to escape from the divided portion, so that the elastic rubber forming region in the mold can be completely and uniformly filled.
[0013]
Furthermore, according to the invention <3>, the unvulcanized rubber can be quickly and uniformly filled in the elastic rubber forming region in the mold without impairing the roundness of the elastic rubber to be installed.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below.
FIG. 1 shows an elastic wheel manufactured by the method of the present invention. The elastic wheel shown in FIG. 1 includes a disk 1 fixed to an axle hub (not shown) and a rim 2 that supports a tire, and is provided between an inner peripheral surface of the rim 2 and an outer peripheral surface of the disk 1. A rubber elastic body 3 as a rubber elastic body is interposed so as to be capable of shearing deformation.
[0015]
That is, in this elastic wheel, a protrusion 4 that protrudes annularly outward in the radial direction of the wheel is integrally formed on the outer peripheral surface of the disk 1 and extends to both sides in the wheel axial direction. The rubber elastic body 3 is fixed in an annular shape by vulcanization adhesion with an appropriate gap between the rubber elastic body 3 and the inner peripheral surface of the rim 2.
[0016]
On the other hand, a pair of guides 5a and 5b are annularly fixed on the inner peripheral surface of the rim 2, and both ends of the rubber elastic body 3 in the axial direction are opposed to the wheel axial direction of the pair of guides 5a and 5b. The two sides are fixed by vulcanization adhesion. Thereby, the rim 2 and the disk 1 are connected via the rubber elastic body 3, and the rubber elastic body 3 can be subjected to shear deformation.
[0017]
If the rubber elastic body 3 extends at least on both sides in the wheel axial direction, it can exhibit a vibration-proof function as an elastic wheel due to its shear strain. However, the elastic wheel manufactured in the present invention has a large deformation at the time of large input. In order to obtain a preventing effect, a rubber elastic body 3 is also interposed between the inner peripheral surface of the rim 2 and the protruding portion 4 of the disk 1 as shown in the figure. That is, the rubber elastic body 3 is integrally provided over the entire width in the wheel axis direction between the pair of guides 5a and 5b. Thereby, in addition to obtaining the effect of suppressing and preventing the small deformation at the time of small input by the shear deformation of the rubber elastic body 3, a portion continuously present on the outer surface in the radial direction of the wheel of the protrusion 4 of the rubber elastic body 3 In addition, it is possible to provide a function as a stopper for avoiding a collision between the protruding portion 4 and the inner peripheral surface of the rim 2 at the time of a large input.
[0018]
In the production of the elastic wheel according to the present invention described above, the method of forming the rubber elastic body 3 becomes important in terms of performance. That is, in order not to impair the durability and safety of the elastic wheel, it is important to fix the rubber elastic body 3 uniformly and with good vulcanization adhesion. For this purpose, in the present invention, three types of molds are prepared: a lower mold 20, an annular middle mold 30, and an upper mold 40 as shown in FIG. Using these molds, the rubber elastic body is vulcanized and bonded between the disk main body to which the rubber elastic body is vulcanized and bonded and the two annular members for guide.
[0019]
The disc body 11 to be prepared is not particularly limited as long as it has a projecting portion 14 projecting annularly outward in the wheel radial direction on the outer peripheral surface of the disc body 11, and the type of support is not limited. It may be a spoke wheel or a mesh wheel combined with the body. The material of the disk may be any material such as steel, aluminum, magnesium, titanium, synthetic resin, etc. to which the rubber elastic body can be vulcanized and bonded, but when focusing on weight reduction, aluminum, titanium or synthetic resin is used. preferable. The two guide annular members 15a and 15b can be made of the same material as that of the disc body.
[0020]
The guide annular members 15a and 15b are preferably provided with flanges 16a and 16b so that they can be easily attached to the inner peripheral surface of the rim.
[0021]
In the manufacturing process of the present invention, as shown in FIG. 3, first, as a process (A), a guide annular member 15b forming one guide is placed in the lower mold 20, and then a process (A). As described above, the disc body 11 is placed on the lower mold 20 on which the guide annular member 15b is placed, with an appropriate gap between the rubber elastic member fixing surface of the guide annular member 15b and the side surface of the protruding portion 14 of the disc body 11. And put it in a coaxial shape.
[0022]
Next, as shown in FIG. 4, first, as a step (c), the annular middle mold 30 is coaxially disposed outside the outer peripheral surface of the protruding portion 14 of the disc body 11 with an appropriate gap from the outer peripheral surface. The inner diameter of the annular middle mold 30 is set larger than the outer diameter of the protruding portion 14 of the disc body 11. Next, the annular guide die 15a forming the other guide is formed on the annular intermediate die 30 with an appropriate gap between the rubber elastic member fixing surface and the side surface of the protruding portion 14 of the disc body 11 so as to be coaxial. Put it in. The annular middle mold 30 can be divided into 2 to 4 parts in the wheel radial direction, and preferably, it is divided into two parts in the wheel radial direction so as to let the injected unvulcanized rubber escape from the divided part 31 as shown in FIG. It is preferable to make it.
[0023]
Next, as shown in FIG. 5, as a step (D), an upper die 40 having at least one unvulcanized rubber injection hole 41 for forming a rubber elastic body is placed on the annular middle die 30. If many unvulcanized rubber injection holes 41 are provided, the injection can be performed as quickly as possible. However, if there are too many injection holes 41, a problem occurs in the roundness of the rubber elastic body. It is preferable that ˜8 injection holes 41 are formed on a coaxial circumference.
[0024]
After placing the upper mold 40, unvulcanized rubber is injected from the unvulcanized rubber injection hole 41 as a step (e). When the unvulcanized rubber is injected, when there are two unvulcanized rubber injection holes 41, as shown schematically in FIG. By injecting the vulcanized rubber, the unvulcanized rubber can be uniformly injected into the mold. In addition, as shown in (B) when there are four unvulcanized rubber injection holes 41, as shown in (C) in the case of six, and as shown in (D) in the case of eight more, It is preferable to drill the upper mold 40 at equal intervals. After the injection of the unvulcanized rubber is completed, the mold is heated and the unvulcanized rubber is vulcanized to form a rubber elastic body. Such vulcanization conditions are not particularly limited, and may be according to normal vulcanization conditions.
[0025]
As the unvulcanized rubber that can be used in the present invention, those known as vibration-proof rubbers can be used. Natural rubbers and synthetic rubbers such as diene rubbers such as butadiene rubber, styrene-butadiene copolymer rubber, and butyl rubber, It can be prepared by appropriately blending a rubber such as ethylene propylene diene terpolymer (EPDM) with an appropriate compounding agent such as sulfur, a vulcanization accelerator, an anti-aging agent, and carbon black. The JIS-A hardness (Hd) of the rubber elastic body after vulcanization is preferably 30 to 80 ° from the viewpoint of vibration absorption characteristics and durability, and the elastic modulus is 1 × 10 3 to 1 × 10 5 N / cm 2 .
[0026]
As described above, the disk main body 11 on which the rubber elastic body is formed is taken out of the mold, and then, as a step (f), guide annular members 15a and 15b fixed to the disk main body 11 via vulcanized rubber. Attach the rim to.
[0027]
The mounting to the rim can be performed by normal joining means such as welding, screwing with an adhesive or a screw, etc., via the flanges 16a and 16b of the guide annular members 15a and 15b. The structure of the rim itself is not particularly limited. For example, a drop portion may be provided as shown in order to facilitate the rim assembly.
[0028]
【The invention's effect】
As described above, according to the present invention, an elastic wheel excellent in ride comfort performance, vibration proof performance and sound proof performance from the time of small input to the time of large input is produced with high durability without impairing durability and safety. It can be manufactured by the property.
[Brief description of the drawings]
FIG. 1 is an enlarged partial cross-sectional view along a rotation axis of an elastic wheel according to the present invention.
FIG. 2 is a perspective view showing a lower mold, a middle mold, and an upper mold used in the present invention.
FIG. 3 is an explanatory view showing steps (a) and (b) of the present invention.
FIG. 4 is an explanatory view showing the process (c) of the present invention.
FIG. 5 is an explanatory view showing a process (d) of the present invention.
FIG. 6 is an explanatory view showing an injection direction of unvulcanized rubber.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Disc 2 Rim 3 Rubber elastic body 4,14 Protrusion part 5a, 5b Guide 11 Disc main body 15a, 15b Guide annular member 16a, 16b Flange 20 Lower mold 30 Ring middle mold 31 Divided part 40 Upper mold 41 Injection hole

Claims (3)

車軸ハブに固着されるディスクと、タイヤを支承するリムとを備え、前記リムの内周面に環状に固設された一対のガイドと、前記ディスクの外周面にホイール半径方向外方に環状に突出する突出部とを有し、該突出部に、前記リムの内周面との間に間隙をもって、前記一対のガイド間のホイール軸方向の全幅にわたって一体的に、ゴム弾性体が環状に固着され、かつ、軸方向両側に延在する該ゴム弾性体の両端部が夫々前記一対のガイドの、ホイール軸方向に対向する両側面に固着された弾性ホイールの製造方法において、
(ア)下型に、一方の前記ガイドを形成するガイド用環状部材を型入れする工程と、
(イ)前記ガイド用環状部材が型入れされた下型に、ディスク本体を、該ガイド用環状部材のゴム弾性部材固着面と該ディスク本体の突出部側面との間に適宜間隙を設けて同軸状に型入れする工程と、
(ウ)環状中型を前記ディスク本体の突出部の外周面外側に、該外周面と適宜間隙を設けて同軸状に配置し、該環状中型に、他方の前記ガイドを形成するガイド用環状部材を、そのゴム弾性部材固着面と前記ディスク本体の突出部側面との間に適宜間隙を設けて同軸状に型入れする工程と、
(エ)前記ゴム弾性体形成用の未加硫ゴム注入孔を1個所以上有する上型を前記環状中型上に同軸状に載置する工程と、
(オ)前記未加硫ゴム注入孔から未加硫ゴムを注入した後、加熱して該未加硫ゴムを加硫し前記ゴム弾性体を形成する工程と、
(カ)加硫後に型から取り出されたディスク本体に前記ゴム弾性体を介して固着されたガイド用環状部材にリムを装着する工程と、
を含むことを特徴とする弾性ホイールの製造方法。
A disc fixed to the axle hub; and a rim for supporting the tire; a pair of guides fixed in an annular shape on the inner peripheral surface of the rim; and an annularly outwardly in the wheel radial direction on the outer peripheral surface of the disc A rubber elastic body is fixed to the protrusion in an annular shape integrally with the entire width in the wheel axial direction between the pair of guides, with a gap between the protrusion and the inner peripheral surface of the rim. In addition, in the method for producing an elastic wheel, both end portions of the rubber elastic body extending on both sides in the axial direction are fixed to both side surfaces of the pair of guides facing each other in the wheel axial direction.
(A) placing a guide annular member forming one of the guides in the lower mold;
(A) A disc body is coaxially disposed in a lower mold in which the annular guide member is placed, with an appropriate gap provided between a rubber elastic member fixing surface of the annular guide member and a side surface of the protruding portion of the disc body. The process of mold-molding,
(C) An annular intermediate mold is arranged outside the outer peripheral surface of the projecting portion of the disk main body and coaxially with the outer peripheral surface, and an annular guide member for forming the other guide is formed on the annular intermediate mold. , A step of providing a suitable gap between the rubber elastic member fixing surface and the side surface of the projecting portion of the disk body, and mold the same coaxially
(D) a step of coaxially placing an upper mold having one or more unvulcanized rubber injection holes for forming the rubber elastic body on the annular middle mold;
(E) injecting unvulcanized rubber from the unvulcanized rubber injection hole and then heating to vulcanize the unvulcanized rubber to form the rubber elastic body;
(F) a step of attaching a rim to the annular guide member fixed to the disc main body taken out of the mold after vulcanization via the rubber elastic body;
The manufacturing method of the elastic wheel characterized by including.
前記環状中型をホイール半径方向に2〜4分割とし、注入された未加硫ゴムを分割部から逃がす請求項1記載の製造方法。The manufacturing method according to claim 1, wherein the annular middle mold is divided into 2 to 4 parts in the wheel radial direction, and the injected unvulcanized rubber is allowed to escape from the divided part. 前記未加硫ゴム注入孔が、前記上型に等間隔で4〜8個同軸状の円周上に穿設されている請求項1または2記載の製造方法。The manufacturing method according to claim 1 or 2, wherein the unvulcanized rubber injection holes are formed in the upper die at equal intervals by 4 to 8 on a coaxial circumference.
JP2002164088A 2002-06-05 2002-06-05 Method for producing elastic wheel Expired - Fee Related JP3886416B2 (en)

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